CA1049364A - Grain harvester equipment - Google Patents
Grain harvester equipmentInfo
- Publication number
- CA1049364A CA1049364A CA159,838A CA159838A CA1049364A CA 1049364 A CA1049364 A CA 1049364A CA 159838 A CA159838 A CA 159838A CA 1049364 A CA1049364 A CA 1049364A
- Authority
- CA
- Canada
- Prior art keywords
- screen
- grain
- duct
- return duct
- mouth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/52—Arrangements for returning unthreshed grain to the threshing device
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Threshing Machine Elements (AREA)
Abstract
ABSTRACT
This invention is related to a collector screen for separating grain from chaff received from a harvester and consists of an additional duct at the rear of the screen for collection anything falling over the rear of the screen and returning it for re-threshing thereby avoiding loss of grain on to the ground.
This invention is related to a collector screen for separating grain from chaff received from a harvester and consists of an additional duct at the rear of the screen for collection anything falling over the rear of the screen and returning it for re-threshing thereby avoiding loss of grain on to the ground.
Description
This invention relates to grain harvester equipment in which a collector screen is used for separating grain from chaff.
According to the present invention there is provided grain harvesting equipment comprising a collector screen for separating grain from chaff, an outlet duct for the grain passing through the screen, a plate positioned rearwardly of the screen so as to define a return duct with an unobstructed mouth between the rear end of the screen and a leading edge of the plate, the mouth being positioned to collect grain which passes over the screen and leading into the outlet duct, means for altering the position of the plate with respect to the screen so as to set both the size and the position of the mouth of the return duct, for opera-tion on level and sloping ground a blower for providing an upward current of air through the outlet duct and the screen and past the mouth of the return duct and a restricted opening between the return duct and the outlet duct for passing grain collected by the return duct into the outlet duct, the dimensions of the opening being restricted to a size adequate to permit the passage of grain while preventing a flow of air from the outlet duct through the return duct sufficient to inhibit the passage of grain into the return duct.
It sometimes happens, particularly when harvesting over unlevel ground, that all the grain does not fall through the screen but that some of it drops over the rear edge of the screen and falls on to the field, and the present invention enables this grain to be collected and returned to be passed over the screen again possibly after rethreshing. The equipment may include two outlet ducts one for delivering separated grain and the other downstream of the first for returning grain and chaff for rethreshing and for then passing back over the screen. With such equipment the return duct can return whatever it collects to the downstream outlet duct.
The return duct may be removed from ~he collector screen and the invention includes as one aspect a fixture for fitting to a collector screen which has means for attaching the fixture at the rear of such a screen and walls defining a return duct positioned to collect grain which passes over D -a-~049364 the screen.
The invention may be carried into practice in various ways and one embodiment will be ~riefly described by way of example with reference to the accompanying draw;ngs, of which:-Figure 1 is a view from the rear and one side of a standardharvester fitted with an attachment according to the invention;
Figure 2 is a view of the grain collecting screen and attachment;
and Figure 3 is a view from the frontand above of the attachment showing the positional relationship between it and the screen.
The harvester indicated generally at 11 includes a thresher and a duct along which threshed grain and chaff is fed by an air stream at lO
over the top of the upper of a pair of screens 13 shown in Figure 2. Side walls 12 above the screens define the open-topped duct. The screens act to separate grain from chaff, and grain will fall through the screens and most of it will fall into an upstream duct 14 for delivery by an auger 41 into sacks. The remainder of the grain and some chaff will fall into a downstream duct 15 for returning by an auger 42 for rethreshing.
` A blower 43 provides a back draught of air 9 up the ducts 14 and 15, to assist in keeping small pieces of chaff from passing through the screen, but the grain can drop against the draught under its own weight. The chaff eventually passes over the top of the screen and is exhausted in the air stream as indicated by the arrow 16 in Figure 3.
However, if, for example, when working uphill, the rear of the screen is tilted downwards grain sometimes falls over the back edge 17 of the screen to the ground and worthwhile quantities of grain are frequently lost.
In accordance with the invention this grain is saved by a fixture 18 in the form of sheet steel walls 27 welded or bolted to the walls 12 and a base 28 welded between the walls 27 to provide a mouth 19 just at the rear end of the sc~een into which such grain can fall without encountering a screen or any other impediment. The collected grain is returned to the duct 15 through ~, ~ - 3 an adjustable opening 20 in the rear wall of the duct, and is delivered for rethreshing and for subsequent return to the screen for separating from chaff.
I`he fixture 18 thus deines with the rear wall of the duct 15, what may be called a return duct having a mouth 19 and an outlet 20 leading into the duct 15. There will be back draught of air passing up the duct 15 for blowing chaff through the screen, and that would tend to prevent grain in the return duct being returned to the duct 15, and for that reason the opening 20 is made adjustable so that it is wide enough to permit the passage of grain while being narrow enough to reduce the pressure of the back draught of air enough to enable the grain to drop freely through the opening 20.
The adjustment of the opening 20 may be achieved by adjusting the position of the edge 46 of the attachment, in relation to the top of the opening 20 For that purpose holes 45 in the attachment and slots ~not shown) in the harvester are used with nuts and bolts to fix the position of the edge 46 in relation to the edge 47 of the opening 20 within limits fixed by the length of the slots.
The fixture is shown in more detail in Figures 2 and 3.
A lid or plate 21 can be positioned either at 21' or 21" in Figure 3 to assist the collection and flow of grain. In the position 21", for opera-tion on steep slopes, lugs 22 welded on the attachment-co-operate with pins 23 on the plate 21 to define pivot axes, and slots 24 in the attachment wall ` and bolts 51 secured to a flange (not shown) on the plate 21, and nuts on the bolts, enable the plate to be held in any pivot position about the axes of the pins 23.
For level, or nearly level, operation, the plate 21 would be in the position indicated at 21'.
In the first position 21' the pins 25 define hinges with similar lugs 52 in the bottom of the attachment. There is a rear pocket 26 which collects any grain not entering the mouth 19. If the driver sees that grain is in the rear pocket, he knows that the plate needs adjusting. Of course it does not matter if some chaff enters the mouth 19. Slots 24' act in a similar manner to the slots 24 to allow the plate to be held in a selected position about the pivot axis.
In the example described, the fixture is an additional attachment to an existing harvester, but on a new harvester it may be built into the screen and duct arrangement to define the mouth and return duct.
To summarize the method of operation, it is explained that air is blown upward through the screens 13 and over the top edge of the plate 21 carrying chaff with it. Grain can drop through the screens, but chaff cannot lQ because it is larger and lighter than grain. Grain passing over the rear end of the screen 13 is not lost on the ground but drops into the return duct through the mouth 19 for mixing with the grain in the duct 15 through the gap 20. Chaff is blown over the mouth by the air stream at 16.
.
.
:, .
r
According to the present invention there is provided grain harvesting equipment comprising a collector screen for separating grain from chaff, an outlet duct for the grain passing through the screen, a plate positioned rearwardly of the screen so as to define a return duct with an unobstructed mouth between the rear end of the screen and a leading edge of the plate, the mouth being positioned to collect grain which passes over the screen and leading into the outlet duct, means for altering the position of the plate with respect to the screen so as to set both the size and the position of the mouth of the return duct, for opera-tion on level and sloping ground a blower for providing an upward current of air through the outlet duct and the screen and past the mouth of the return duct and a restricted opening between the return duct and the outlet duct for passing grain collected by the return duct into the outlet duct, the dimensions of the opening being restricted to a size adequate to permit the passage of grain while preventing a flow of air from the outlet duct through the return duct sufficient to inhibit the passage of grain into the return duct.
It sometimes happens, particularly when harvesting over unlevel ground, that all the grain does not fall through the screen but that some of it drops over the rear edge of the screen and falls on to the field, and the present invention enables this grain to be collected and returned to be passed over the screen again possibly after rethreshing. The equipment may include two outlet ducts one for delivering separated grain and the other downstream of the first for returning grain and chaff for rethreshing and for then passing back over the screen. With such equipment the return duct can return whatever it collects to the downstream outlet duct.
The return duct may be removed from ~he collector screen and the invention includes as one aspect a fixture for fitting to a collector screen which has means for attaching the fixture at the rear of such a screen and walls defining a return duct positioned to collect grain which passes over D -a-~049364 the screen.
The invention may be carried into practice in various ways and one embodiment will be ~riefly described by way of example with reference to the accompanying draw;ngs, of which:-Figure 1 is a view from the rear and one side of a standardharvester fitted with an attachment according to the invention;
Figure 2 is a view of the grain collecting screen and attachment;
and Figure 3 is a view from the frontand above of the attachment showing the positional relationship between it and the screen.
The harvester indicated generally at 11 includes a thresher and a duct along which threshed grain and chaff is fed by an air stream at lO
over the top of the upper of a pair of screens 13 shown in Figure 2. Side walls 12 above the screens define the open-topped duct. The screens act to separate grain from chaff, and grain will fall through the screens and most of it will fall into an upstream duct 14 for delivery by an auger 41 into sacks. The remainder of the grain and some chaff will fall into a downstream duct 15 for returning by an auger 42 for rethreshing.
` A blower 43 provides a back draught of air 9 up the ducts 14 and 15, to assist in keeping small pieces of chaff from passing through the screen, but the grain can drop against the draught under its own weight. The chaff eventually passes over the top of the screen and is exhausted in the air stream as indicated by the arrow 16 in Figure 3.
However, if, for example, when working uphill, the rear of the screen is tilted downwards grain sometimes falls over the back edge 17 of the screen to the ground and worthwhile quantities of grain are frequently lost.
In accordance with the invention this grain is saved by a fixture 18 in the form of sheet steel walls 27 welded or bolted to the walls 12 and a base 28 welded between the walls 27 to provide a mouth 19 just at the rear end of the sc~een into which such grain can fall without encountering a screen or any other impediment. The collected grain is returned to the duct 15 through ~, ~ - 3 an adjustable opening 20 in the rear wall of the duct, and is delivered for rethreshing and for subsequent return to the screen for separating from chaff.
I`he fixture 18 thus deines with the rear wall of the duct 15, what may be called a return duct having a mouth 19 and an outlet 20 leading into the duct 15. There will be back draught of air passing up the duct 15 for blowing chaff through the screen, and that would tend to prevent grain in the return duct being returned to the duct 15, and for that reason the opening 20 is made adjustable so that it is wide enough to permit the passage of grain while being narrow enough to reduce the pressure of the back draught of air enough to enable the grain to drop freely through the opening 20.
The adjustment of the opening 20 may be achieved by adjusting the position of the edge 46 of the attachment, in relation to the top of the opening 20 For that purpose holes 45 in the attachment and slots ~not shown) in the harvester are used with nuts and bolts to fix the position of the edge 46 in relation to the edge 47 of the opening 20 within limits fixed by the length of the slots.
The fixture is shown in more detail in Figures 2 and 3.
A lid or plate 21 can be positioned either at 21' or 21" in Figure 3 to assist the collection and flow of grain. In the position 21", for opera-tion on steep slopes, lugs 22 welded on the attachment-co-operate with pins 23 on the plate 21 to define pivot axes, and slots 24 in the attachment wall ` and bolts 51 secured to a flange (not shown) on the plate 21, and nuts on the bolts, enable the plate to be held in any pivot position about the axes of the pins 23.
For level, or nearly level, operation, the plate 21 would be in the position indicated at 21'.
In the first position 21' the pins 25 define hinges with similar lugs 52 in the bottom of the attachment. There is a rear pocket 26 which collects any grain not entering the mouth 19. If the driver sees that grain is in the rear pocket, he knows that the plate needs adjusting. Of course it does not matter if some chaff enters the mouth 19. Slots 24' act in a similar manner to the slots 24 to allow the plate to be held in a selected position about the pivot axis.
In the example described, the fixture is an additional attachment to an existing harvester, but on a new harvester it may be built into the screen and duct arrangement to define the mouth and return duct.
To summarize the method of operation, it is explained that air is blown upward through the screens 13 and over the top edge of the plate 21 carrying chaff with it. Grain can drop through the screens, but chaff cannot lQ because it is larger and lighter than grain. Grain passing over the rear end of the screen 13 is not lost on the ground but drops into the return duct through the mouth 19 for mixing with the grain in the duct 15 through the gap 20. Chaff is blown over the mouth by the air stream at 16.
.
.
:, .
r
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Grain harvesting equipment comprising a collector screen for separating grain from chaff, an outlet duct for the grain passing through the screen, a plate positioned rearwardly of the screen so as to define a return duct with an unobstructed mouth between the rear end of the screen and a leading edge of the plate, the mouth being positioned to collect grain which passes over the screen and leading into the outlet duct, means for altering the position of the plate with respect to the screen so as to set both the size and the position of the mouth of the return duct, for operation on level and sloping ground a blower for pro-viding an upward current of air through the outlet duct and the screen and past the mouth of the return duct, and a restricted opening between the return duct and the outlet duct for passing grain collected by the return duct into the outlet duct, the dimensions of the opening being restricted to a size adequate to permit the passage of grain while preventing a flow of air from the outlet duct through the return duct sufficient to inhibit the passage of grain into the return duct.
2. Equipment as claimed in Claim 1 in which there are two outlet ducts for grain passing through the screen one of which ducts is upstream of the other.
3. Equipment as claimed in Claim 1 in which the restricted opening is adjustable in size.
4. Equipment as claimed in Claim 1 in which a grain collecting pocket is defined behind the plate.
5. Equipment as claimed in Claim 1 in which the return duct is removable from the collector screen and outlet duct.
6. A fixture for fitting to a collector screen in a grain harvester having an outlet duct arranged to collect grain passing through the screen, the fixture having means for attaching the fixture at the rear of such a screen and walls defining a return duct having an unobstructed mouth positioned to collect grain which passes over the screen and defining with a part of the harvester a restricted opening for the passage of grain from the return duct to the outlet duct, means for adjusting the restricted opening to restrict the flow of air from the outlet duct to the return duct, a plate positioned rearwardly of the screen and defining therewith the mouth of the return duct, and means for altering the position of the plate with respect to the screen so as to set both the position and size of the mouth of the return duct for operation on level and sloping ground.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6005271A GB1412108A (en) | 1971-12-23 | 1971-12-23 | Grain harvester equipment |
| GB1909872 | 1972-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1049364A true CA1049364A (en) | 1979-02-27 |
Family
ID=26253848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA159,838A Expired CA1049364A (en) | 1971-12-23 | 1972-12-22 | Grain harvester equipment |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3881497A (en) |
| AU (1) | AU468480B2 (en) |
| CA (1) | CA1049364A (en) |
| DE (1) | DE2263161A1 (en) |
| FR (1) | FR2165670A5 (en) |
| GB (1) | GB1412108A (en) |
| IT (1) | IT974249B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4805640A (en) * | 1987-06-12 | 1989-02-21 | Deere & Company | Straw walker extension pan |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609929A (en) * | 1949-04-04 | 1952-09-09 | King Alexander | Grain and weed reclaiming accessory |
| US2670845A (en) * | 1950-06-30 | 1954-03-02 | Leonard W H Busack | Grain separating process and apparatus |
| US3109433A (en) * | 1960-10-25 | 1963-11-05 | Claas Reinhold | Threshing mechanism, particularly for combine harvesters |
| US3202154A (en) * | 1963-07-03 | 1965-08-24 | Carl H Viebrock | Grain saving attachment for combine |
-
1971
- 1971-12-23 GB GB6005271A patent/GB1412108A/en not_active Expired
-
1972
- 1972-12-21 IT IT54948/72A patent/IT974249B/en active
- 1972-12-22 US US317818A patent/US3881497A/en not_active Expired - Lifetime
- 1972-12-22 AU AU50501/72A patent/AU468480B2/en not_active Expired
- 1972-12-22 CA CA159,838A patent/CA1049364A/en not_active Expired
- 1972-12-22 FR FR7245958A patent/FR2165670A5/fr not_active Expired
- 1972-12-22 DE DE2263161A patent/DE2263161A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1412108A (en) | 1975-10-29 |
| FR2165670A5 (en) | 1973-08-03 |
| AU468480B2 (en) | 1974-06-27 |
| DE2263161A1 (en) | 1973-06-28 |
| US3881497A (en) | 1975-05-06 |
| IT974249B (en) | 1974-06-20 |
| AU5050172A (en) | 1974-06-27 |
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